1 /* 2 * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 #include <assert.h> 7 #include <gic_common.h> 8 #include <gicv2.h> 9 #include <interrupt_mgmt.h> 10 #include <platform.h> 11 12 /* 13 * The following platform GIC functions are weakly defined. They 14 * provide typical implementations that may be re-used by multiple 15 * platforms but may also be overridden by a platform if required. 16 */ 17 #pragma weak plat_ic_get_pending_interrupt_id 18 #pragma weak plat_ic_get_pending_interrupt_type 19 #pragma weak plat_ic_acknowledge_interrupt 20 #pragma weak plat_ic_get_interrupt_type 21 #pragma weak plat_ic_end_of_interrupt 22 #pragma weak plat_interrupt_type_to_line 23 24 #pragma weak plat_ic_get_running_priority 25 #pragma weak plat_ic_is_spi 26 #pragma weak plat_ic_is_ppi 27 #pragma weak plat_ic_is_sgi 28 #pragma weak plat_ic_get_interrupt_active 29 #pragma weak plat_ic_enable_interrupt 30 #pragma weak plat_ic_disable_interrupt 31 #pragma weak plat_ic_set_interrupt_priority 32 #pragma weak plat_ic_set_interrupt_type 33 #pragma weak plat_ic_raise_el3_sgi 34 #pragma weak plat_ic_set_spi_routing 35 36 /* 37 * This function returns the highest priority pending interrupt at 38 * the Interrupt controller 39 */ 40 uint32_t plat_ic_get_pending_interrupt_id(void) 41 { 42 unsigned int id; 43 44 id = gicv2_get_pending_interrupt_id(); 45 if (id == GIC_SPURIOUS_INTERRUPT) 46 return INTR_ID_UNAVAILABLE; 47 48 return id; 49 } 50 51 /* 52 * This function returns the type of the highest priority pending interrupt 53 * at the Interrupt controller. In the case of GICv2, the Highest Priority 54 * Pending interrupt register (`GICC_HPPIR`) is read to determine the id of 55 * the pending interrupt. The type of interrupt depends upon the id value 56 * as follows. 57 * 1. id < PENDING_G1_INTID (1022) is reported as a S-EL1 interrupt 58 * 2. id = PENDING_G1_INTID (1022) is reported as a Non-secure interrupt. 59 * 3. id = GIC_SPURIOUS_INTERRUPT (1023) is reported as an invalid interrupt 60 * type. 61 */ 62 uint32_t plat_ic_get_pending_interrupt_type(void) 63 { 64 unsigned int id; 65 66 id = gicv2_get_pending_interrupt_type(); 67 68 /* Assume that all secure interrupts are S-EL1 interrupts */ 69 if (id < PENDING_G1_INTID) { 70 #if GICV2_G0_FOR_EL3 71 return INTR_TYPE_EL3; 72 #else 73 return INTR_TYPE_S_EL1; 74 #endif 75 } 76 77 if (id == GIC_SPURIOUS_INTERRUPT) 78 return INTR_TYPE_INVAL; 79 80 return INTR_TYPE_NS; 81 } 82 83 /* 84 * This function returns the highest priority pending interrupt at 85 * the Interrupt controller and indicates to the Interrupt controller 86 * that the interrupt processing has started. 87 */ 88 uint32_t plat_ic_acknowledge_interrupt(void) 89 { 90 return gicv2_acknowledge_interrupt(); 91 } 92 93 /* 94 * This function returns the type of the interrupt `id`, depending on how 95 * the interrupt has been configured in the interrupt controller 96 */ 97 uint32_t plat_ic_get_interrupt_type(uint32_t id) 98 { 99 unsigned int type; 100 101 type = gicv2_get_interrupt_group(id); 102 103 /* Assume that all secure interrupts are S-EL1 interrupts */ 104 return type == GICV2_INTR_GROUP1 ? INTR_TYPE_NS : 105 #if GICV2_G0_FOR_EL3 106 INTR_TYPE_EL3; 107 #else 108 INTR_TYPE_S_EL1; 109 #endif 110 } 111 112 /* 113 * This functions is used to indicate to the interrupt controller that 114 * the processing of the interrupt corresponding to the `id` has 115 * finished. 116 */ 117 void plat_ic_end_of_interrupt(uint32_t id) 118 { 119 gicv2_end_of_interrupt(id); 120 } 121 122 /* 123 * An ARM processor signals interrupt exceptions through the IRQ and FIQ pins. 124 * The interrupt controller knows which pin/line it uses to signal a type of 125 * interrupt. It lets the interrupt management framework determine 126 * for a type of interrupt and security state, which line should be used in the 127 * SCR_EL3 to control its routing to EL3. The interrupt line is represented 128 * as the bit position of the IRQ or FIQ bit in the SCR_EL3. 129 */ 130 uint32_t plat_interrupt_type_to_line(uint32_t type, 131 uint32_t security_state) 132 { 133 assert(type == INTR_TYPE_S_EL1 || 134 type == INTR_TYPE_EL3 || 135 type == INTR_TYPE_NS); 136 137 /* Non-secure interrupts are signaled on the IRQ line always */ 138 if (type == INTR_TYPE_NS) 139 return __builtin_ctz(SCR_IRQ_BIT); 140 141 /* 142 * Secure interrupts are signaled using the IRQ line if the FIQ is 143 * not enabled else they are signaled using the FIQ line. 144 */ 145 return ((gicv2_is_fiq_enabled()) ? __builtin_ctz(SCR_FIQ_BIT) : 146 __builtin_ctz(SCR_IRQ_BIT)); 147 } 148 149 unsigned int plat_ic_get_running_priority(void) 150 { 151 return gicv2_get_running_priority(); 152 } 153 154 int plat_ic_is_spi(unsigned int id) 155 { 156 return (id >= MIN_SPI_ID) && (id <= MAX_SPI_ID); 157 } 158 159 int plat_ic_is_ppi(unsigned int id) 160 { 161 return (id >= MIN_PPI_ID) && (id < MIN_SPI_ID); 162 } 163 164 int plat_ic_is_sgi(unsigned int id) 165 { 166 return (id >= MIN_SGI_ID) && (id < MIN_PPI_ID); 167 } 168 169 unsigned int plat_ic_get_interrupt_active(unsigned int id) 170 { 171 return gicv2_get_interrupt_active(id); 172 } 173 174 void plat_ic_enable_interrupt(unsigned int id) 175 { 176 gicv2_enable_interrupt(id); 177 } 178 179 void plat_ic_disable_interrupt(unsigned int id) 180 { 181 gicv2_disable_interrupt(id); 182 } 183 184 void plat_ic_set_interrupt_priority(unsigned int id, unsigned int priority) 185 { 186 gicv2_set_interrupt_priority(id, priority); 187 } 188 189 int plat_ic_has_interrupt_type(unsigned int type) 190 { 191 switch (type) { 192 #if GICV2_G0_FOR_EL3 193 case INTR_TYPE_EL3: 194 #else 195 case INTR_TYPE_S_EL1: 196 #endif 197 case INTR_TYPE_NS: 198 return 1; 199 default: 200 return 0; 201 } 202 } 203 204 void plat_ic_set_interrupt_type(unsigned int id, unsigned int type) 205 { 206 int gicv2_type = 0; 207 208 /* Map canonical interrupt type to GICv2 type */ 209 switch (type) { 210 #if GICV2_G0_FOR_EL3 211 case INTR_TYPE_EL3: 212 #else 213 case INTR_TYPE_S_EL1: 214 #endif 215 gicv2_type = GICV2_INTR_GROUP0; 216 break; 217 case INTR_TYPE_NS: 218 gicv2_type = GICV2_INTR_GROUP1; 219 break; 220 default: 221 assert(0); 222 } 223 224 gicv2_set_interrupt_type(id, gicv2_type); 225 } 226 227 void plat_ic_raise_el3_sgi(int sgi_num, u_register_t target) 228 { 229 #if GICV2_G0_FOR_EL3 230 int id; 231 232 /* Target must be a valid MPIDR in the system */ 233 id = plat_core_pos_by_mpidr(target); 234 assert(id >= 0); 235 236 /* Verify that this is a secure SGI */ 237 assert(plat_ic_get_interrupt_type(sgi_num) == INTR_TYPE_EL3); 238 239 gicv2_raise_sgi(sgi_num, id); 240 #else 241 assert(0); 242 #endif 243 } 244 245 void plat_ic_set_spi_routing(unsigned int id, unsigned int routing_mode, 246 u_register_t mpidr) 247 { 248 int proc_num = 0; 249 250 switch (routing_mode) { 251 case INTR_ROUTING_MODE_PE: 252 proc_num = plat_core_pos_by_mpidr(mpidr); 253 assert(proc_num >= 0); 254 break; 255 case INTR_ROUTING_MODE_ANY: 256 /* Bit mask selecting all 8 CPUs as candidates */ 257 proc_num = -1; 258 break; 259 default: 260 assert(0); 261 } 262 263 gicv2_set_spi_routing(id, proc_num); 264 } 265 266 void plat_ic_set_interrupt_pending(unsigned int id) 267 { 268 gicv2_set_interrupt_pending(id); 269 } 270 271 void plat_ic_clear_interrupt_pending(unsigned int id) 272 { 273 gicv2_clear_interrupt_pending(id); 274 } 275 276 unsigned int plat_ic_set_priority_mask(unsigned int mask) 277 { 278 return gicv2_set_pmr(mask); 279 } 280 281 unsigned int plat_ic_get_interrupt_id(unsigned int raw) 282 { 283 unsigned int id = (raw & INT_ID_MASK); 284 285 if (id == GIC_SPURIOUS_INTERRUPT) 286 id = INTR_ID_UNAVAILABLE; 287 288 return id; 289 } 290